Roller-mill.



PATBNTED JUNE 4, 1907.

J.. WSTENHFER.

ROLLER MILL.

APPLICATION FILED 23.14, me.

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.TULIUs wsTENEoEER, oF DORTMUND, GERMANY.

-ROLLERf-MILL.

Specification of Letters Patent.

Patented June 4, 1907.

Application nea February 14,1908. Serial No. 301,049.

To @ZZ whom it may concern,.-

Be it known'that I, JULIUs Ws'rENnFER,

a subject of the King of Prussia, and a resident of fKronprinzenstrasse, Dortmund, in the Province of Westphalia, German Empire, have invented certain new and useful Imrovements in Roller-Mi lls, of which the folowing is an exact s ecification.

My invention re ates to roller mills and more especially to grinding .mills in which the articles to be ground are disintegrated and powdered by the centrifugal power of rollers. Ihese rollers travel over grinding surfaces and are operated by a wheel having a specific form, the so-called driver.

In order to makemrny invention clear, I refer to the accompanying drawing, in which:

Figure 1 is a longitudinal section of myimproved grinding machine, on line A-A of the Fig. 2. Fig. 2 is 'a vertical cross section on line A-A of Fig. 1. Fig. 3 is a plan view of the machine, Fig. 4 is avvertical cross section on line B-B of the Fig.- l.

In the drawings a is a hollow shaft and a. bearings carrying said shaft a. On the latter `the wheel b, the so-called driver, is mounted and secured thereto. The driver b is provided with channels b and with chambers' b2. In these chambers two rollers c are situated. More than two rollers can be employed according to the special requirements of the Work. The arms b3 of the driver do not project to the peripheral surface b? of the driver in order to have a communication between the channels- 12' and the chambers b2. In the driver b bores d are arranged near to its circumference lying arallel to its rotary axis and extending tllfrough the driver. The

. channels b are in communication with the hollow shaft by openi ors b5 provided therein. The driver bis surroun ed by a grinding mantle e provided with the grinding surface e.

The mantle e is provided with openings e2, the purpose of whic is hereinafter described. The mantle e is fixed to a casin f, loosely mounted on the hollowshaft g wghich is carried by the hollow shaft a and secured thereto. The

casing f is provided with floats f to form a fan and is put in motion in the manneras hereinafter described. The casing f is mclosed air-tight by an outer case h ha'ying two I vopenings h h2; the former being rovided Yma with the steel mantle e carrying the grinding surface, a differential mechanism and a truck crank is provided, as can be seen from Fig. 4. The toothed wheel i is stationary mounted on said hollowishaft g. The wheel 'i' is eccentrically mounted on the shaft g by means of the annular projection 'i2 and being provided with an inner toothed boss 'i3 with which the toothed wheel 'l'. engages. The wheel i runs idle on the shaft g. For the purpose of transmitting the motion of the wheel '1/ to the casing the wheel 'i' is connected by means of the ro c to the truck crank 7c firmly attached at the hub k2 of the casing In order to impart to t e casing f a number of revolutions somewhat increased over that of thedriver b the driving mechanism as just before described is used. If for eX- ample the number of teeth of the toothed wheel 'i amounts to n and that of the inner toothed boss 113 amounts to 'n.-I- 1 the ratio of transmission between the casingf and the driver b is The casing f and the mantle e vcarrying the grinding surface can be of course stationary arranged. y' f f The hollow shaft is'rotated by I neans of the pulley a2 and for stopping the machine the pulley a3 'is providedV running idle on -the shaft a.

The hollow shaft ais closed at its left hand side by a valve m which can be adjusted by means of the lever m hinged at the support s2 and of the adjusting screw m3.

At the righthand side a feeding device is arranged consisting of the funnel o and the worm o situated in the hollow shaft a and carried by the rod o2 rotated by the belt disk 03.

The machine as before described operates in the following manner The articles to be ground ordisintegrated are introduced by means of the hopper o, Jfed to the driver b by the worm o', and enter the chambers b2 through the openings b5 of the shaft a and the channels b articles to be -ground are ressed a ainst the grindin surface @'and a so the ro 1ers c are taken a ong bythe driver and thereby rotated O tothe centrifugal power these rotatroll ersv are forced with a considerable pressure'vagaf t'igfthe grinding surface, thereby grindingthe-grains and the like. However not only'onlthe grinding surface a disintegration rtvdlies 'place,jb1`1-t also between the As the driver brotates, the

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rollers c themselves and the rollers and the walls of the chambers b2. For obtainin a large centrifugal ower at a small relatlve motion between te rollers and the grindin surface the latter is driven by the describe differential mechanism.

Rollers of equal or different diameters or of varied sha es may be used and the grinding mantle adapted in form thereto. Rollers worn out by the operation of the mill may be readily replaced by new ones.

Owing to the arrangement of the floats the rotating casingf acts like a fan and t e ground articles, say the finished product, is

sucked up and conveyed through the openings d traveling together with the driver over the grinding surface, and the apertures e2 of the mantle e to the space h5 and therefrom to the opening 71. in order to be led away. The quantity of air from which the largeness of the grain sucked up depends, is regulated by adjusting the valve m.

The material not sufiiciently ground is separated from the finished product by the sieve h3 and is discharged from the machine through the opening 71,2.

Having now fully described the nature of my invention, what I desire to secure by Letters Patent of the United States is 1. A roller mill comprising in combination, a driver provided with chambers, a plurality of rollers, in each of said chambers being mounted several rollers, a grinding mantle having a grinding surface, a casing to which said grinding mantle is fixed, floats secured to said casing, means for rotating said casing and grinding mantle, a hollow shaft carrying said driver, a hollow shaft co-axially arranged with said first shaft and supporting said casing, an outer case inclosing said casing and means for feeding the articles to be ground.

2. In a roller mill as described, a hollow shaft for feeding the material to be ground', a plurality of rollers, a driver having chambers or locating several rollers therein, and hollow arms for feeding the material to be ground, and channels lying parallel with said hollow shaft for discharging the ground material, and a grinding mantle co erating with said rollers and having bores, t irough which the material passes when ground.

3. In a roller mill as described, a differential mechanism, a casing operated by said differential mechanism, a hollow shaft carrying the latter which consists of a toothed wheel (i) firmly attached to said shaft, a wheel (i) eccentrically and freely mounted on said shaft, and being provided with an inner toothed boss engaging with said wheel (i), a rod gc), a truck crank connected with the wheel 11') by said rod, and firmly attached at said casing.

4. In a roller mill, the combination with a driver, of a hollow shaft, a rod axially arranged in said hollow shaft, a feeding worm carried by said rod, a hop er at one end of said hollow shaft, and disc iarging therein, a regulating disk at the other end of the hollow shaft mounted on said rod, and means for adj usting the disk.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

JULIUS VVUSTENHOFER. Witnesses:

PETER LIEBER, WILLIAM EssENwEIN. 

